Update the docs a little. Add property to allow incremental stepping so that we can reduce excessive queueing.
Original commit message from CVS: * docs/design/draft-framestep.txt: * docs/design/part-negotiation.txt: Fix two typos.
Original commit message from CVS: * docs/design/draft-framestep.txt: Some ideas about a framestep API * docs/design/part-element-transform.txt: Start design and use cases for basetransform in order to get it fixed soon.
